(Edit... Sorry - meant the image viewer. I somehow failed to notice the dedicated photo cropper, but the image viewer does all that and is great for browsing large photo collections)

Double click on your photo to open it up.

Right click anywhere on the photo then select Edit > Crop board.

The cropping frame can easily be re-sized by dragging the edges.

You might wish to remember to save the cropped image under a new name, but before you do so, go into the Options menu and choose the quality of the saved image. You can also save it in different formats, for instance, a .tif format will not degrade when/if you make further changes.

(Edit... Sorry - meant the image viewer. I somehow failed to notice the dedicated photo cropper, but the image viewer does all that and is great for browsing large photo collections)

Double click on your photo to open it up.

Right click anywhere on the photo then select Edit > Crop board.

The cropping frame can easily be re-sized by dragging the edges.

You might wish to remember to save the cropped image under a new name, but before you do so, go into the Options menu and choose the quality of the saved image. You can also save it in different formats, for instance, a .tif format will not degrade when/if you make further changes.